HISTORIC
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In 1763 British Astronomers Charles Mason and Jeremiah Dixon began their survey to mark the boundary between Maryland and Pennsylvania. Ordered by the Court Chancery in England, it was to settle the disputes between the heirs of Lord Baltimore and William Penn. One of the earliest survey projects of North America, it set the highest standards of engineering surveys. The expedition took them four years and their line stretches over 200 miles from Delaware to West Virginia. In the 19th century it was continued along the course of the Ohio River and came to mark the boundary between slave state and free.

The Mason Dixon Line
Geography & History